Which law is used to calculate the total current in a parallel circuit?

In a parallel circuit, Kirchhoff's Current Law is utilized to calculate the total current. This law states that the total current entering a junction or node must equal the total current leaving that junction. In parallel circuits, multiple branches share the same voltage across them, and the total current is the sum of the currents through each branch.

Each branch may have a different resistance, and according to Ohm's Law, the current through each branch can be calculated using the voltage across that branch divided by its resistance. By summing the individual branch currents, you can determine the total current flowing in the circuit. This application of summing currents is a direct usage of Kirchhoff's Current Law, making it the correct law to refer to in this context.

The other laws mentioned do not apply specifically to calculating total current in parallel circuits. Ohm's Law relates voltage, current, and resistance but does not account for the total current in circuits with multiple paths. Faraday's Law pertains to electromagnetic induction and is not relevant here, while Newton's Law deals with motion and forces in physics and does not apply to electrical circuits.